If hit with a bright enough flash of light, such detectors are blinded.
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The performance of such detectors improves dramatically at lower temperatures.
Japan was the first country to deploy such detectors.
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The other type would be network-based intrusion-detectors such as a machine running Marcus J.
Ranum's Network Flight Recorder (see Resources), as opposed to host-based detectors such as Tripwire.
So, in the light of all this, one has to wonder how appropriate it would be for schools here to adopt some of the American innovations, such as metal-detectors.
And in the next few years, scientists are planning even more ambitions detectors, such as XENON1T and LUX-Zeplin - they are hoping to find the first experimental evidence of these particles.
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Some students say they want the administration to install security features such as extra cameras and metal detectors.
Older alarm devices and panels are prone to failure and life-safety sensors such as smoke and carbon monoxide detectors must be periodically replaced to work reliably.
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Under the Merida Initiative, the United States will provide extra kit (such as night-vision gear and metal detectors) and training.
It detailed safety precautions such as keeping 24 fire extinguishers and 11 smoke detectors on hand.
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According to the report, programs such as Portal Shield "will facilitate the integration of chemical detectors into personal warfighter gear" as well as installation of the sensors on aircraft, ships, armored vehicles and unmanned aerial vehicles.
They include products and devices such as Bluetooth headsets used with cell phones, handheld metal detectors used by airport security, iPods, iPhones, electric blankets and pills that are swallowed and used to image internal organs by transmitting wireless data.
The observatory, which is named after the physicist who discovered the showers caused by cosmic rays, has 1, 600 detectors on the ground to record the arrival of such cascades and 24 telescopes pointing at the sky to locate the flashes of light produced by the collisions that create them.
However, such instruments are blinded by the intense infrared radiation emitted by flames, which overwhelm the sensitive detectors and limit their use in the field.
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X-ray detectors for identifying impurities in semiconductor chips (among other things) would be interested in such a device.
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